Outputting a key based on an authorized sequence of operations

ABSTRACT

Values and a sequence of operations associated with generating a key may be received. A determination may be made as to whether the sequence of operations associated with the key matches an authorized sequence of operations. The key may be outputted when the received sequence of operations matches the authorized sequence of operations and the key may not be outputted when the received sequence of operations does not match the authorized sequence of operations.

RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/808,691, filed on Jul. 24, 2015, which claims the benefit under 35U.S.C. § 119(e) of U.S. Provisional Application 62/033,061 filed on Aug.4, 2014 and U.S. Provisional Application 62/093,231 filed on Dec. 17,2014, which are hereby incorporated by reference.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will be understood more fully from the detaileddescription given below and from the accompanying drawings of variousimplementations of the disclosure.

FIG. 1 illustrates an environment associated with the outputting of akey based on an authorized sequence of operations in accordance withsome embodiments.

FIG. 2 is a flow diagram of an example method to output a generated keybased on an authorized sequence of operations in accordance with someembodiments of the present disclosure.

FIG. 3A is a block diagram of an example authorized sequence ofoperations to generate a key in accordance with some embodiments.

FIG. 3B is a block diagram of an example sequence of operations thatdoes not match the authorized sequence of operations in accordance withsome embodiments.

FIG. 3C is a block diagram of another example sequence of operationsthat does not match the authorized sequence of operations in accordancewith some embodiments.

FIG. 3D is a block diagram of another example sequence of operationsthat does not match the authorized sequence of operations in accordancewith some embodiments.

FIG. 4A is a flow diagram of an example method to output a generated keybased on a sequence of operations, an authorized sequence of operations,and a hash value of a key in accordance with some embodiments of thedisclosure.

FIG. 4B is a flow diagram of an example method to output a generated keybased on a hash value of the generated key in accordance with someembodiments.

FIG. 5 is a flow diagram of an example method to receive a hash valueassociated with a generated key or to not receive the hash valueassociated with the generated key based on a change in a sequence ofoperations generating the key or a change in a status of a keycontribution in accordance with some embodiments of the presentdisclosure.

FIG. 6 illustrates a block diagram of an embodiment of a computer systemin which some embodiments of the disclosure may operate.

DETAILED DESCRIPTION

Aspects of the present disclosure are directed to outputting a key basedon an authorized sequence of operations. An integrated circuit mayinclude a key engine component that generates a key based on receivedinput values and a sequence of operations that are to be performed withthe input values. For example, the key engine component may receive avalue from a key contributor component (e.g., a component that generatesan input value for the key engine component) of the integrated circuitand additional values from an operating entity (e.g., software) usingthe integrated circuit. The operating entity may further provide thesequence of operations to be performed by the key engine component togenerate the key. In response to the received values and the sequence ofoperations, the key engine component may generate and output the keywhich may subsequently be used to encrypt or decrypt data. As anexample, the operating entity may be a content provider that transmitsencrypted video data to a decryption component of the integrated circuitand provides values and the sequence of commands for the key enginecomponent to generate and transmit a key to the decryption component fordecrypting the encrypted video data.

As previously described, the key engine component may receive a sequenceof operations from an operating entity that are used to generate thekey. If the operating entity is an unauthorized entity (e.g., an entitythat does not know the key that will be generated by the key enginecomponent), then the unauthorized entity may be able to derive the keyby retrieving an output of a portion of the sequence of operations. Forexample, the key may be intended to be generated based on an authorizedsequence of operations that includes a first, second, and thirdoperation. The first operation may be performed, then the secondoperation may be performed based on an output of the first operation,and the third operation may subsequently be performed based on an outputof the second operation. The output of the third operation may then beoutput or provided as the generated key. However, the unauthorizedentity may provide a sequence of operations that includes the first andsecond operations but does not include the third operation. Instead, thesequence of operations provided by the unauthorized entity may directthe key engine to perform the first operation, then perform the secondoperation, and output or provide the output of the second operation. Forexample, the output of the second operation may be a portion of thegenerated key or a value that is used to generate the key. If theunauthorized entity retrieves the portion of the generated key or thevalue that is used to generate the key, then unauthorized entity may beable to derive the key from the retrieved portion or value. As such, thekey that is used to decrypt encrypted data may be retrieved by anunauthorized entity resulting in the unsecured transmission of theencrypted data.

The key engine component may be implemented to output, transmit, orprovide the key after an authorized sequence of operations has beenperformed. For example, the authorized sequence of operations mayspecify a number of operations, types of operations, sources of inputdata for the operations, destination for outputs of the operations, andthe order of the operations that are to be performed by the key enginecomponent when generating a key. The key engine component may thenoutput or provide the generated key based on the authorized sequence ofoperations. For example, if the sequence of operations received from theoperating entity matches the authorized sequence of operations, then thegenerated key may be outputted or provided by the key engine component.However, if the received sequence of operations does not match theauthorized sequence of operations, then no value (e.g., a key, partialkey, or a value used to generate the key) may be outputted or providedby the engine component.

Furthermore, the key engine component may output or provide a key basedon a received hash value and a status of a key contributor component ofthe integrated circuit. The key contributor component may provide avalue (e.g., a hardware value) that is used to generate the key. The keyengine component may receive the hash value for a first request togenerate a key. If the received hash value matches a hash valuecalculated by the key engine component for the generated key, then thekey may be output or provided by the key engine component to adecryption component. For a subsequent second request to generateanother key, the key engine component may generate and output the key ifthe sequence of operations and the status of the key contributorcomponent between the first request to generate the key and the secondrequest to generate the key have not changed. However, if the sequenceof operations or the status of the key contributor component has changedfrom the first request to the second request, then the key enginecomponent may request the hash value from the operating entity and thekey may be provided or output if the received hash value matches thehash value calculated by the key engine component. As such, the keyengine component may only require a hash value to be received from theoperating entity when either the sequence of operations changes or whenthe status of the key contribution component has changed in relation tothe prior key that was generated.

As described above, the key engine component may be used to output orprovide a value (e.g., a key) when certain conditions are satisfied. Forexample, the key engine component may output a value when a receivedsequence of operations matches an authorized sequence of operations.Furthermore, the key engine component may output a value when a hashvalue received from an operating entity matches a hash value that thekey engine component calculates for the generated key. The outputting orproviding of a value based on the above described conditions may ensurethat values that correspond to a portion of the key or a value that isused to generate the key is not outputted or provided by the key enginecomponent. Thus, an unauthorized entity may not be able to retrieve thepartial key or value used to generate the key and subsequently attemptto derive the key. Aspects of the present disclosure address the aboveand other deficiencies.

FIG. 1 illustrates an example environment 100 associated with theoutputting of a key based on an authorized sequence of operations. Ingeneral, the environment 100 may include a device or integrated circuit150 that receives a sequence of commands and values from an operatingentity 140 to generate and output or provide a key 131.

As shown in FIG. 1, the integrated circuit 150 may include a keycontributor component 110, a key engine component 120, and decryptioncomponents 130. In some embodiments, the key contributor component 110,key engine component 120, and the decryption components 130 may each beincluded on the same integrated circuit 150. The integrated circuit 150may be included in a device (e.g., a set top box, television, etc.) thatreceives information from the operating entity 140 (e.g., a softwareapplication). The operating entity 140 may provide to the keycontributor component 110 data 141 that includes an operator keycontribution input value and an operator status. The operator keycontribution input value may be referred to as an operator control wordcontribution (CWC). The operator status may specify configurationinformation for the key contributor component 110. Furthermore, the keycontributor component 110 may provide a key contribution value 111 (alsoreferred to as a CWC) to the key engine component 120 based on theoperator status and the operator key contribution input value receivedfrom the operating entity 140. For example, the key contribution value111 may be based on hardware of the key contribution component 110.

The key engine component 120 may receive the key contribution value 111from the key contributor 110 and may further receive data 142 from theoperating entity 140. The data 142 may include input values (e.g.,software values) and a sequence of operations from the operating entity140. Furthermore, the key engine component 120 may also receive, fromthe operating entity 140, a hash value corresponding to a key that willbe generated by the key engine component 120. The key engine component120 may perform the sequence of operations based on the received inputvalues from the operating entity 140 and the key contribution value 111from the key contributor component 110. Furthermore, the key enginecomponent 120 may output, transmit, or provide the key 121 if thesequence of operations matches an authorized sequence of operations.Further details with regard to when the key 121 may be outputted,provided, or transmitted to the decryption component 130 are describedin conjunction with FIGS. 2-5.

The decryption components 130 may receive the key 121 from the keyengine component 120 and encrypted data 143 from the operating entity140. Furthermore, the decryption components 130 may decrypt theencrypted data 143 with the key 121 to transmit the decrypted data 131.

FIG. 2 is a flow diagram of an example method 200 to output a generatedkey based on an authorized sequence of operations. In general, themethod 200 may be performed by processing logic that may comprisehardware (e.g., processing device, circuitry, dedicated logic,programmable logic, microcode, hardware of a device, etc.), software(e.g., instructions run or executed on a processing device), or acombination thereof. The key engine component 120 of FIG. 1 may performthe method 200.

As shown in FIG. 2, the method 200 may begin with the processing logicreceiving values associated with a key (block 210). For example, ahardware based value (e.g., a CWC from the key contributor component110) and multiple software based values (e.g., input values from theoperating entity 140) may be received. The hardware based values and thesoftware based values may be used to generate the key. The valuesassociated with the key may be key split values or other such input datathat is used to generate a key. The processing logic may further receivea sequence of operations associated with generating a key based on thereceived values (block 220). The sequence of operations may specify aplurality of types of cryptographic operations, sources of inputs forthe cryptographic operations, destinations for outputs of thecryptographic operations, and an order for performing the cryptographicoperations. Further details with regard to sequences of operations aredisclosed with reference to FIGS. 3A-3D. The processing logic mayidentify an authorized sequence of operations associated with the outputof a generated key (block 230). The authorized sequence of operationsmay specify particular cryptographic operations, sources of inputs forthe cryptographic operations, destinations of outputs for thecryptographic operations, and the order for the cryptographic operationsto be performed. Subsequently, the processing logic may determine if thereceived sequence of operations matches the authorized sequence ofoperations (block 240). If the received sequence of operations does notmatch the authorized sequence of operations, then a generated key maynot be outputted, provided, or transmitted (block 250). For example, thekey engine component may not output or provide a value (e.g., a key,portion of the key, or a value used to generate the key) to thedecryption components of an integrated circuit that includes the keyengine component. However, if the received sequence of operations doesmatch the authorized sequence of operations, then the generated key maybe outputted, provided, or transmitted (block 260). For example, a keymay be generated based on the received sequence of operations with thereceived hardware based and software based values. The key may then beoutputted, provided, or transmitted to the decryption components fordecrypting encrypted data.

As such, the key engine component may provide or output a value when areceived sequence of commands matches an authorized sequence ofcommands. However, the key engine component may not provide or outputthe value when the received sequence of commands does not match theauthorized sequence of commands.

FIG. 3A is a block diagram of an example authorized sequence ofoperations 300 to generate a key. In general, the authorized sequence ofoperations 300 may be stored in a memory of a key engine component(e.g., key engine component 120 of FIG. 1).

As shown in FIG. 3A, the authorized sequence of operations 300 mayinclude multiple functions or operations. For example, the authorizedsequence of operations 300 may include a first operation 310, a secondoperation 320, and a third operation 330. In some embodiments, each ofthe operations 310, 320, and 330 may correspond to a cryptographicfunction or operation. Examples of such cryptographic operationsinclude, but are not limited to, exclusive-or (XOR) operations, AdvancedEncryption Standard (AES) operations, European TelecommunicationsStandards Institute (ETSI) operations, etc. The operations 310, 320, and330 may receive values and may perform an operation with two values togenerate an output value. For example, the first operation 310 mayperform an XOR operation based on a first software based value 302(e.g., from an operating entity 140) and a first hardware based value301 (e.g., from a key contributor component) and provide a first outputvalue 311 to the second operation 320. Furthermore, the second operation320 may receive a second software based value 303 and may perform an AESoperation with the second software based value 303 and the first outputvalue 311 from the first operation 310 to generate a second output value321. Subsequently, the third operation 330 may perform another XORoperation based on a third software based value 304 and the secondoutput value 321 to generate a third output value 331. In someembodiments, the third output value 331 may be the generated key. Forexample, the final output value from the final operation of the sequenceof operations may correspond to the generated key.

FIG. 3B is a block diagram of an example sequence of operations 340 thatdoes not match the authorized sequence of operations 300. In general,the sequence of operations 340 may be received by a key engine component(e.g., key engine component 120 of FIG. 1) and compared with anauthorized sequence of operations.

As shown in FIG. 3B, the sequence of operations 340 includes the firstoperation 310 and the third operation 330, but does not include thesecond operation 320. Instead, a fourth operation 350 has replaced thesecond operation 320. For example, a different cryptographic operationhas replaced the second cryptographic operation used in the authorizedsequence of operations and, as a result, the fourth operation 350outputs a fourth output value 352 as opposed to the second output valueof 321 and the third operation 330 may output another output value 351.As such, the sequence of operations 340 does not match the authorizedsequence of operations 300 as at least one of the operations has changed(e.g., the second operation 320 corresponds to an AES operation and thefourth operation 350 corresponds to an XOR operation).

FIG. 3C is a block diagram of another example sequence of operations 360that does not match the authorized sequence of operations 300. Ingeneral, the sequence of operations 360 may be received by a key enginecomponent (e.g., the key engine component 120 of FIG. 1) and comparedwith an authorized sequence of operations.

As shown in FIG. 3C, the sequence of operations 360 includes a fewernumber of operations than the authorized sequence of operations 300. Forexample, instead of including a first, second, and third operation, thesequence of operations 360 includes the first and second operations. Assuch, the sequence of operations 360 includes a command to provide oroutput the result of the second operation 321 (e.g., a value used in thegeneration of the key or a portion of the key). For example, the outputdestination of the second operation is not the third operation (e.g.,the output of the second operation is not an input of the thirdoperation as in the authorized sequence of operations). Since thesequence of operations 360 includes fewer operations and a differentoutput destination for the second operation than the authorized sequenceof operations and does not specify to provide or output from the keyengine component after performing the third operation, the sequence ofoperations 360 does not match the authorized sequence of operations 300.

FIG. 3D is a block diagram of another example sequence of operations 380that does not match the authorized sequence of operations 300. Ingeneral, the sequence of operations 380 may be received by a key enginecomponent (e.g., the key engine component 120 of FIG. 1) and comparedwith an authorized sequence of operations.

As shown in FIG. 3D, the sequence of operations 380 includes operations310, 320, and 330. However, operation 330 receives a hardware basedvalue 384 instead of the third software based value 304. The operation330 may generate an output value 381 based on the hardware based value384 and the second output value 321 from the second operation 320.However, since one of the sources of the input values of the operation330 has changed (e.g., from the software based value 304 to the hardwarebased value 384), the sequence of operations 380 does not match theauthorized sequence of operations 300. As such, sources of input valuesmay be compared with the sources of the input values of the authorizedsequence of operations to determine if there is a match with theauthorized sequence of operations.

The comparing of the sequence of operations 340, 360, or 380 with theauthorized sequence of operations 300 may be based on a comparing ofhash values. For example, the authorized sequence of operations 300 maybe represented by a hash value that is compared with a running hashvalue that corresponds to a currently executed operation from thesequence of operations 340, 360, or 380. As an example, a running hashvalue of the sequence of operations may be updated as each operation isperformed or executed. For example, a first operation may generate arunning hash value that is based on the type of the first operation andthe input source of the first operation. A second operation may updatethe running hash value based on an output of the first operation, thetype of the second operation, and the input source of the secondoperation. The running hash value may be similarly updated for eachsubsequent operation that is performed. The final operation may providea final update to the running hash value and the final updated runninghash value may be compared with the hash value of the authorizedsequence of operations to determine if the sequence of operationsmatches the authorized sequence of operations.

FIGS. 3A-3D illustrate an example authorized sequence of operations andother sequences of operations. However, any combination of operationsmay be used for the purposes of the present disclosure and FIGS. 3A-3Dare provided only as examples.

FIG. 4A is a flow diagram of an example method 400 to output a generatedkey based on a sequence of operations, an authorized sequence ofoperations, and a hash value of a key. In general, the method 400 may beperformed by processing logic that may comprise hardware (e.g.,processing device, circuitry, dedicated logic, programmable logic,microcode, hardware of a device, etc.), software (e.g., instructions runor executed on a processing device), or a combination thereof. The keyengine component 120 of FIG. 1 may perform the method 400.

As shown in FIG. 4A, the method 400 may begin with the processing logicreceiving a sequence of operations and values associated with generatinga key (block 410). The processing logic may further receive a hash valueassociated with the key (block 420). For example, an operating entitymay provide the sequence of operations, values, and the hash valueassociated with the key. A key may be generated based on the sequence ofoperations and the received values (block 430). For example, a series ofcryptographic operations may be performed based on software based valuesfrom the operating entity and hardware based values from a keycontributor component. The result may be a value that corresponds to agenerated key. The processing logic may further determine a hash valueof the generated key (block 440). The hash value may be determined by ahash function. In some embodiments, a hash function may map digital dataof arbitrary size (e.g., a generated key) to digital data of fixed size(e.g., the hash value of the generated key) where differences in inputdata produce differences in output data.

The processing logic may determine if the received sequence ofoperations matches an authorized sequence of operations (block 445). Ifthe received sequence of operations does match the received sequence ofoperations, then the generated key may be outputted or provided (block450). If the received sequence of operations does not match the receivedsequence of operations, the processing logic may subsequently determineif the received hash value matches the generated hash value of thegenerated key (block 460). If the received hash value does not match thehash value that has been generated or calculated from the generated key,then the generated key may not be outputted or provided (block 470). Forexample, a value may not be transmitted from a key engine component todecryption components of an integrated circuit. However, if the receivedhash value does match the determined hash value of the generated key,then the generated key may be outputted or provided and the receivedsequence of operations may be recorded as an authorized sequence ofoperations (block 480). For example, a value may be transmitted from thekey engine component to decryption components of the integrated circuitand the key engine component may compare a subsequent sequence ofoperations with the newly recorded sequence of operations.

FIG. 4B is a flow diagram of an example method 490 to output a generatedkey based on a hash value of the generated key. In general, the method490 may be performed by processing logic that may comprise hardware(e.g., processing device, circuitry, dedicated logic, programmablelogic, microcode, hardware of a device, etc.), software (e.g.,instructions run or executed on a processing device), or a combinationthereof. The key engine component 120 of FIG. 1 may perform the method490.

As shown in FIG. 4B the method 490 may begin with the processing logicreceiving a sequence of operations and values associated with generatinga key (block 491). The processing logic may further receive a hash valueassociated with the key (block 492). For example, an operating entitymay provide the sequence of operations, values, and the hash valueassociated with the key. The processing logic may generate a key basedon the received sequence of operations and the values (block 493). Forexample, a series of cryptographic operations may be performed based onsoftware based values from the operating entity and hardware basedvalues from a key contributor component. The result may be a value thatcorresponds to a generated key. The processing logic may furtherdetermine a hash value of the generated key (block 494). The hash valuemay be determined or calculated by a hash function. In some embodiments,a hash function may map digital data of arbitrary size (e.g., agenerated key) to digital data of fixed size (e.g., the hash value ofthe generated key) where differences in input data produce differencesin output data.

The processing logic may subsequently determine if the received hashvalue matches the determined hash value of the generated key (block495). If the received hash value does not match the hash value that hasbeen determined or calculated from the generated key, then the generatedkey may not be outputted or provided (block 496). For example, a valuemay not be transmitted from a key engine component to decryptioncomponents of an integrated circuit. However, if the received hash valuedoes match the determined hash value of the generated key, then thegenerated key may be outputted or provided (block 497). For example, avalue may be transmitted from the key engine component to decryptioncomponents of the integrated circuit.

As such, a value corresponding to a key may be provided from a keyengine component to decryption components of an integrated circuit whena received hash value matches a determined or calculated hash value of agenerated key. The matching of the received hash value with thedetermined hash value of the key may indicate that the provider of thereceived hash value (e.g., the operating entity) may be an authorizedentity (e.g., not an unauthorized entity seeking to retrieve the key orvalues associated with generating the key) since the received hash valuematches the hash value of the key that is generated, thereby indicatingthat the operating entity is aware of the contents of the key.

FIG. 5 is a flow diagram of an example method 500 to receive a hashvalue associated with a generated key or to not receive the hash valueassociated with the generated key based on a change in a sequence ofoperations generating the key or a change in a status of a keycontributor component. In general, the method 500 may be performed byprocessing logic that may comprise hardware (e.g., processing device,circuitry, dedicated logic, programmable logic, microcode, hardware of adevice, etc.), software (e.g., instructions run or executed on aprocessing device), or a combination thereof. The key engine component120 of FIG. 1 may perform the method 500.

As shown in FIG. 5, the method 500 may begin with the processing logicauthorizing a sequence of operations (block 510). For example, a firstkey may be generated at a first time by the key engine component basedon the authorized sequence of operations. Subsequently, at a secondtime, a request to generate a second key may be received. The processinglogic may thus receive values and a sequence of operations associatedwith generating the second key (block 520). The processing logic mayfurther receive a status of the key contributor (e.g., key contributorcomponent 110) (block 530). In some embodiments, status information ofthe key contributor may be changed when an operating entity changes. Forexample, a first operating entity may provide a first configuration orimplementation for the key contributor so that when the first operatingentity provides a first input value to the key contributor, the keycontributor may transmit a first output value (e.g., a CWC or the keycontribution value) to the key engine component. A subsequent secondoperating entity may provide a second configuration or implementationfor the key contributor to replace the first configuration orimplementation. The second operating entity may then provide a secondinput value and the key contributor may then use the secondconfiguration or implementation to generate a second output value basedon the second input value and provide the second output value to the keyengine component. As such, the status of the key contributor may specifya configuration or implementation of the key contributor where a changein the status indicates a different configuration or implementation thatis used to generate a key contribution value or CWC.

Referring to FIG. 5, the processing logic may determine if the sequenceof operations or the status of the key contributor have changed sincethe authorization of the sequence of operations (block 540). Forexample, a determination may be made if the sequence of operations andthe status of the key contributor when the first key was generated aredifferent than the received sequence of operations and the receivedstatus of the key contributor for the generating of the second key. Ifneither the sequence of operations nor the status of the key contributorhave changed since the generation of the first key, then the second keymay be outputted or provided (block 550). However, if either or both ofthe sequence of operations or the status of the key contributor havechanged since the generation of the first key, then a hash valueassociated with the second key may be received (block 560). For example,if the sequence of operations or the status of the key contributor ofthe prior key (e.g., the first key) have changed, then a request may betransmitted by the key engine component to the operating entity (e.g.,software) to provide the hash value associated with the second key.Subsequently, the processing logic may determine if the hash valuereceived from the operating entity matches the hash value of the secondkey (block 570). For example, the second key may be generated based onthe sequence of operations and the hash value of the second key may becalculated or generated by the key engine component. If the receivedhash value does not match the calculated hash value of the second key,then the second key may not be outputted or provided (block 580). Forexample, a value may not be transmitted between the key engine anddecryption components of an integrated circuit. However, if the receivedhash value does match the generated hash value of the second key, thenthe second key may be outputted or provided (block 590). For example, avalue may be transmitted between the key engine and the decryptioncomponents of the integrated circuit.

As such, the hash value may not be required to output a key if thesequence of operations used to generate the prior key and the status ofthe key contributor when the prior key was generated have not changed.Accordingly, subsequent keys may be generated without providing the hashvalue to the key engine component when the sequence of operations andthe status of the key contributor matches the prior sequence ofoperations and the prior status of the key contributor when the priorkey was generated.

In some embodiments, the operating entity may provide the valuesassociated with generating a key and may not provide the sequence ofoperations. In such a case, the prior sequence of operations may beused. If the operating entity provides a new sequence of operations thatdiffers from the prior sequence of operations, then the hash value maybe requested from the operating entity. Furthermore, in someembodiments, the comparing of the sequence of operations with theauthorized sequence of operations or the prior sequence of operationsmay include the comparing of hash values corresponding to the sequencesof operations. For example, an authorized hash value corresponding tothe authorized sequence of operations may be compared with a runninghash value corresponding to a currently executed operation from thesequence of operations.

FIG. 6 illustrates an example machine of a computer system 600 withinwhich a set of instructions, for causing the machine to perform any oneor more of the methodologies discussed herein, may be executed. Inalternative implementations, the machine may be connected (e.g.,networked) to other machines in a LAN, an intranet, an extranet, and/orthe Internet. The machine may operate in the capacity of a server or aclient machine in client-server network environment, as a peer machinein a peer-to-peer (or distributed) network environment, or as a serveror a client machine in a cloud computing infrastructure or environment.

The machine may be a personal computer (PC), a tablet PC, a set-top box(STB), a Personal Digital Assistant (PDA), a cellular telephone, a webappliance, a server, a network router, a switch or bridge, or anymachine capable of executing a set of instructions (sequential orotherwise) that specify actions to be taken by that machine. Further,while a single machine is illustrated, the term “machine” shall also betaken to include any collection of machines that individually or jointlyexecute a set (or multiple sets) of instructions to perform any one ormore of the methodologies discussed herein.

The example computer system 600 includes a processing device 602, a mainmemory 604 (e.g., read-only memory (ROM), flash memory, dynamic randomaccess memory (DRAM) such as synchronous DRAM (SDRAM) or Rambus DRAM(RDRAM), etc.), a static memory 606 (e.g., flash memory, static randomaccess memory (SRAM), etc.), and a data storage device 618, whichcommunicate with each other via a bus 630.

Processing device 602 represents one or more general-purpose processingdevices such as a microprocessor, a central processing unit, or thelike. More particularly, the processing device may be complexinstruction set computing (CISC) microprocessor, reduced instruction setcomputing (RISC) microprocessor, very long instruction word (VLIW)microprocessor, or processor implementing other instruction sets, orprocessors implementing a combination of instruction sets. Processingdevice 602 may also be one or more special-purpose processing devicessuch as an application specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA), a digital signal processor (DSP),network processor, or the like. The processing device 602 is configuredto execute instructions 626 for performing the operations and stepsdiscussed herein.

The computer system 600 may further include a network interface device608 to communicate over the network 620. The computer system 600 alsomay include a video display unit 610 (e.g., a liquid crystal display(LCD) or a cathode ray tube (CRT)), an alphanumeric input device 612(e.g., a keyboard), a cursor control device 614 (e.g., a mouse), agraphics processing unit 622, a signal generation device 616 (e.g., aspeaker), graphics processing unit 622, video processing unit 628, andaudio processing unit 632.

The data storage device 618 may include a machine-readable storagemedium 624 (also known as a computer-readable medium) on which is storedone or more sets of instructions or software 626 embodying any one ormore of the methodologies or functions described herein. Theinstructions 626 may also reside, completely or at least partially,within the main memory 604 and/or within the processing device 602during execution thereof by the computer system 600, the main memory 604and the processing device 602 also constituting machine-readable storagemedia.

In one implementation, the instructions 626 include instructions toimplement functionality corresponding to a key engine (e.g., key engine120 of FIG. 1). While the machine-readable storage medium 624 is shownin an example implementation to be a single medium, the term“machine-readable storage medium” should be taken to include a singlemedium or multiple media (e.g., a centralized or distributed database,and/or associated caches and servers) that store the one or more sets ofinstructions. The term “machine-readable storage medium” shall also betaken to include any medium that is capable of storing or encoding a setof instructions for execution by the machine and that cause the machineto perform any one or more of the methodologies of the presentdisclosure. The term “machine-readable storage medium” shall accordinglybe taken to include, but not be limited to, solid-state memories,optical media and magnetic media.

Some portions of the preceding detailed descriptions have been presentedin terms of algorithms and symbolic representations of operations ondata bits within a computer memory. These algorithmic descriptions andrepresentations are the ways used by those skilled in the dataprocessing arts to most effectively convey the substance of their workto others skilled in the art. An algorithm is here, and generally,conceived to be a self-consistent sequence of operations leading to adesired result. The operations are those requiring physicalmanipulations of physical quantities. Usually, though not necessarily,these quantities take the form of electrical or magnetic signals capableof being stored, combined, compared, and otherwise manipulated. It hasproven convenient at times, principally for reasons of common usage, torefer to these signals as bits, values, elements, symbols, characters,terms, numbers, or the like.

It should be borne in mind, however, that all of these and similar termsare to be associated with the appropriate physical quantities and aremerely convenient labels applied to these quantities. Unlessspecifically stated otherwise as apparent from the above discussion, itis appreciated that throughout the description, discussions utilizingterms such as “identifying” or “determining” or “executing” or“performing” or “collecting” or “creating” or “sending” or the like,refer to the action and processes of a computer system, or similarelectronic computing device, that manipulates and transforms datarepresented as physical (electronic) quantities within the computersystem's registers and memories into other data similarly represented asphysical quantities within the computer system memories or registers orother such information storage devices.

The present disclosure also relates to an apparatus for performing theoperations herein. This apparatus may be specially constructed for theintended purposes, or it may comprise a general purpose computerselectively activated or reconfigured by a computer program stored inthe computer. Such a computer program may be stored in a computerreadable storage medium, such as, but not limited to, any type of diskincluding floppy disks, optical disks, CD-ROMs, and magnetic-opticaldisks, read-only memories (ROMs), random access memories (RAMs), EPROMs,EEPROMs, magnetic or optical cards, or any type of media suitable forstoring electronic instructions, each coupled to a computer system bus.

The algorithms and displays presented herein are not inherently relatedto any particular computer or other apparatus. Various general purposesystems may be used with programs in accordance with the teachingsherein, or it may prove convenient to construct a more specializedapparatus to perform the method. The structure for a variety of thesesystems will appear as set forth in the description below. In addition,the present disclosure is not described with reference to any particularprogramming language. It will be appreciated that a variety ofprogramming languages may be used to implement the teachings of thedisclosure as described herein.

The present disclosure may be provided as a computer program product, orsoftware, that may include a machine-readable medium having storedthereon instructions, which may be used to program a computer system (orother electronic devices) to perform a process according to the presentdisclosure. A machine-readable medium includes any mechanism for storinginformation in a form readable by a machine (e.g., a computer). Forexample, a machine-readable (e.g., computer-readable) medium includes amachine (e.g., a computer) readable storage medium such as a read onlymemory (“ROM”), random access memory (“RAM”), magnetic disk storagemedia, optical storage media, flash memory devices, etc.

In the foregoing specification, implementations of the disclosure havebeen described with reference to specific example implementationsthereof. It will be evident that various modifications may be madethereto without departing from the broader spirit and scope ofimplementations of the disclosure as set forth in the following claims.The specification and drawings are, accordingly, to be regarded in anillustrative sense rather than a restrictive sense.

What is claimed is:
 1. A method comprising: receiving a plurality ofvalues associated with generating a key; receiving a sequence ofoperations associated with generating the key using the plurality ofvalues; determining, by a processing device, whether the receivedsequence of operations corresponds to an authorized sequence ofoperations associated with generating the key, wherein the receivedsequence of operations corresponds to the authorized sequence ofoperations responsive to one or more sources of the received pluralityof values matching one or more sources of values specified by theauthorized sequence of operations; and in response to determining thatthe received sequence of operations corresponds to the authorizedsequence of operations, providing the key based on the received sequenceof operations and the plurality of values.
 2. The method of claim 1,wherein determining whether the received sequence of operationscorresponds to the authorized sequence of operations comprises:generating a first hash value based on the received sequence ofoperations; receiving a second hash value based on the authorizedsequence of operations; and determining whether the first hash valuematches the second hash value, wherein the received sequence ofoperations corresponds to the authorized sequence of operationsresponsive to the first hash value matching the second hash value. 3.The method of claim 1, wherein the received sequence of operationsspecifies an order of operations that are performed to generate the key.4. The method of claim 1, wherein the received sequence of operationsspecifies an order of the received values that are inputs to respectiveoperations in the received sequence of operations.
 5. The method ofclaim 1, further comprising: in response to determining that thereceived sequence of operations does not correspond to the authorizedsequence of operations, determining to not provide the key based on thereceived sequence of operations and the plurality of values.
 6. Themethod of claim 1, further comprising: decrypting data with the providedkey in response to determining that the received sequence of operationscorresponds to the authorized sequence of operations.
 7. A systemcomprising: a memory; and a processing device, operatively coupled withthe memory, to: receive a plurality of values associated with generatinga key; receive a sequence of operations associated with generating thekey using the plurality of values; determine whether the receivedsequence of operations corresponds to an authorized sequence ofoperations associated with generating the key, wherein the receivedsequence of operations corresponds to the authorized sequence ofoperations responsive to one or more sources of the received pluralityof values matching one or more sources of values specified by theauthorized sequence of operations; and in response to determining thatthe received sequence of operations corresponds to the authorizedsequence of operations, provide the key based on the received sequenceof operations and the plurality of values.
 8. The system of claim 7,wherein to determine whether the received sequence of operationscorresponds to the authorized sequence of operations, the processingdevice is further to: generate a first hash value based on the receivedsequence of operations; receive a second hash value based on theauthorized sequence of operations; and determine whether the first hashvalue matches the second hash value, wherein the received sequence ofoperations corresponds to the authorized sequence of operationsresponsive to the first hash value matching the second hash value. 9.The system of claim 7, wherein the received sequence of operationsspecifies an order of operations that are performed to generate the key.10. The system of claim 7, wherein the received sequence of operationsspecifies an order of the received values that are inputs to respectiveoperations in the received sequence of operations.
 11. The system ofclaim 7, wherein the processing device is further to: in response todetermining that the received sequence of operations does not correspondto the authorized sequence of operations, determine to not provide thekey based on the received sequence of operations and the plurality ofvalues.
 12. The system of claim 7, wherein the processing device isfurther to: decrypt data with the provided key in response todetermining that the received sequence of operations corresponds to theauthorized sequence of operations.
 13. A non-transitory computerreadable medium comprising instructions, which when executed by aprocessing device, cause the processing device to perform operationscomprising: receiving a plurality of values associated with generating akey; receiving a sequence of operations associated with generating thekey using the plurality of values; determining whether the receivedsequence of operations corresponds to an authorized sequence ofoperations associated with generating the key, wherein the receivedsequence of operations corresponds to the authorized sequence ofoperations responsive to one or more sources of the received pluralityof values matching one or more sources of values specified by theauthorized sequence of operations; and in response to determining thatthe received sequence of operations corresponds to the authorizedsequence of operations, providing the key based on the received sequenceof operations and the plurality of values.
 14. The non-transitorycomputer readable medium of claim 13, wherein to determine whether thereceived sequence of operations corresponds to the authorized sequenceof operations, the operations further comprise: generating a first hashvalue based on the received sequence of operations; receiving a secondhash value based on the authorized sequence of operations; anddetermining whether the first hash value matches the second hash value,wherein the received sequence of operations corresponds to theauthorized sequence of operations responsive to the first hash valuematching the second hash value.
 15. The non-transitory computer readablemedium of claim 13, wherein the received sequence of operationsspecifies an order of operations that are performed to generate the key.16. The non-transitory computer readable medium of claim 13, wherein thereceived sequence of operations specifies an order of the receivedvalues that are inputs to respective operations in the received sequenceof operations.
 17. The non-transitory computer readable medium of claim13, the operations further comprising: in response to determining thatthe received sequence of operations does not correspond to theauthorized sequence of operations, determining to not provide the keybased on the received sequence of operations and the plurality ofvalues.
 18. The non-transitory computer readable medium of claim 13, theoperations further comprising: decrypting data with the provided key inresponse to determining that the received sequence of operationscorresponds to the authorized sequence of operations.